I'll probably get the Seekins AR 30mm rings but wondered if there are others to look at. Scope will be a SS 1-6 (some day), SS 3-9 or Vortex PST/NF 2.5-10X32. The stock is a Magpul CTR. I want to go light, have no need for a QD mount. Can I go lower than the Seekins AR rings or will I run into trouble with the charging handle or cheek weld?